Business Insider rounded up all the data that has so far been published by the largest banks, insurers, and asset managers in the UK. It includes international firms like Goldman Sachs and JPMorgan, which have large operations in Britain.

It is, in theory, possible for firms to have a gender pay gap where women earn more than men on average but it is a rarity. Average pay at all firms on this list is higher for men than that for women.

Institutions are ranked in ascending order by the size of their mean pay gap between men and women, while median pay gaps are also included.

This list will be updated as more firms release their pay stats as the government's April 5 deadline approaches.

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Bank of America Merrill Lynch — 17.1%

A man walks near a Bank of America branch in New York's Times Square Decemeber 11, 2008.
REUTERS/Brendan McDermid